Example 3: Drain Pipe Trap Shape Defective - Panasonic Urban Multi MX1 Series Manual

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PACD011001G2 / PACD011004G3

7.3

Example 3:

Situation

Indoor unit was fitted with a drain trap but a leak occurred during subsequent operation.

Source of Problem

The trap was not properly shaped thus preventing it from functioning effectively as a trap and resulting in

and Remedial

drain leakage. The trap was reshaped and the fault disappeared.

Action

Main Points

Reason:There is resistance on the air inlet side caused by the heat exchanger and air filter and this in turn

creates negative pressure in relation to the atmospheric pressure on the discharge side. If there is no drain

trap then air will be drawn in from the drain pipe and the waste water splashed around giving rise to the risk

of water overflowing from the drain pan. To avoid this problem it is therefore necessary to design a trap

which takes account of the maximum negative pressure which is likely to be created on the suction side.

Urban Multi Inverter "MX1" Series

Drain pipe trap shape defective

Duct types (40~125) require a drain trap.

Bad Examples and Good Examples in Installation

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